package com.leng.util;

import javax.servlet.http.HttpServletRequest;

public class RequestUtil {
	
	/**
	 * 判断当前请求是否为ajax请求
	 * @param request
	 * @return
	 */
	public static boolean isAjaxRequest(HttpServletRequest request){
		String acceptHeader = request.getHeader("X-Requested-With");
		return acceptHeader!=null && acceptHeader.equals("XMLHttpRequest");
	}
	/**
	 * 获取真实的请求ip
	 * @param request
	 * @return
	 */
	public static String getRealIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("X-Real-IP");
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;        
    }

}
